On July 14, 2014 between midnight and 2:00 a.m., USM graduate student Nathan Broaddus recorded the impact of a King Tide using a GeoXT Trimble GPS device. Through two perimeter walks he produced polylines approximating the flood outline on Marginal Way and Cove Street in Portland. He repeated the same process on October 9 to measure the tidal effect in a different month and show a seasonal variation, which proved to be significant. The blue area on the map shows the outline of the flood as traced in July, and the magenta area represents the shape in October. The red outline was traced in December 4, 2013 using a mobile mapping app.
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